yes, the disease is progressive, but so, too, is science. and as we await those discoveries, we have at our fingertips the enduring power of the human spirit to be passed on from one to the next. i don't know what lies ahead, but i already know there will be remarkable people along the way, just as there've always been. >> when i see you go out for hikes and walks i just think how great that is and how hopeful i am. >> narrator: me, too. >> and i think that there are things on the road that will make it continue. i refuse to think any other way. >> narrator: me, too. >> i'm a blogger, a tweeter, a citizen of facebook and a resident of second life. >> my five-year-old daughter picked up my iphone as soon as she lost her pacifier. >> you're going to war for 12 hours. then at the end of the day, you're at the dinner table, talking to your kids about their homework. >> i don't feel like there's any distinction between the cyber and the real. this is virtual reality. here we are. frontline continues online >> the day after i got my diagnosis... >